Knob attachment



(No Model.)

E. S. WINCHESTER..

KNOB ATTACHMENT. 110.416,310. Patented Dec. 3,v 1889.

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' UNITED ASTATES PATENT EErcE.

EDVARD S. IVINCHESTER, OF DORCHESTER, MASSACHUSETTS.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. l1-6,310, datedDecember 3, 1889.

.Application filed February l5. 1889. Serial No. 300,076. (No model.)

To @ZZ whom. tamay concern.-

Be it known that I, EDWARD S. WINCHEs- TER, of Dorchester, in the countyof Sulolk and State of Massachusetts, have invented certain Improvementsin Door-Latches, of which the following is a specification.

The object of my invention is to provide for the ready connection anddisconnection of the knobs and knob-spindle, and to prevent looseness orrattling of the parts when in operative position. y

To this end it consists, in a peculiar construction and arrangement ofpart-s, having as its basis a knob-shank toothed to interlock with theusual hub or tumbler by which the latch is operated, as hereinafterexplained in detail.

In the drawings I have illustrated my invention as applied to arim-latch; but it is to be understood that it may be applied in likeform and manner to the mortise-latch.

In the accompanying drawings, Figure l is a vertical transverse sectionthrough a latch provided with my improvements. Fig. 2 is an outline Viewshowing the mannerin which the knobs are unlocked. Fig. 3 is aperspective view of the knob-spindle and co-operating parts.

Referring to the drawings, A represents a latch-case, having, as usual,the inner and outer walls d and a', and also having on one in the case bf the side 'ournalsh b as usual .l J 7 a,

and is provided on one side with a projection b2, extending into thesleeve a2 of the case, and toothed or notched at the outer end, asshown.

C represents the inner knob,having a shank c inserted within the sleevea2 of the case, and toothed at its end to interlock with the hub B. Whenthe parts are interlocked, the rotation of the knob compels a likemovement of the hub. By moving the knob endwise it may be disengagedfrom the hub, so as to turn independently.

D represents the outer knob, rigidly and permanently aiiixed to one endof the spindle, which has a square or angular portion d and a threadedextremityl d.

E represents a strong spiral spring, which is slipped over the spindleand against the outer knob D. The'square portion of the spindle ispassed through the hub B, and its threaded end screw-ed in-to the knobC. The spring acting between the hub and the outer knob D urges thespindle outward in the direction indicated by the arrow in Fig. 1, andthe spindle in turn acts to draw the inner knob toward the case, so asto keep its toothed or serrated end in engagement with the hub, as shownin Fig. l. When the parts are thus interlocked, the rotation of eitherknob serves to turn the hub, which is prevented from rotating on thespindle by reason of the angular form of the latter serving to preventthe rotation of the inner knob C upon the spindle, and thus prevents theparts being separated.

In order to remove lthe knobs, it is \only necessary to push axially onthe outer knob D with force sufficient to compress the spring. Theeffect of this action is to push on the spring endwise and carry theinner knob C out of engagement with the hub B, as indicated in Fig. 2.rlhis leaves the inner knob free to be unscrewed from the spindle, afterwhich the latter may be withdrawn in an endwise direction. v

In assembling the parts the spindle with the spring thereon is firstinserted and the spring compressed, after which the knob-seat is screwedinward to the required point. The knob B is then relieved from pressure,and the reaction of the spring causes the interlocking of the knob andhub.

It will be Observed that under my construction the spring is the onlypiece used in addition to those ordinarily employed in springlatches. Itwill also be observed that the spring serves not only to maint-ain theconnect-ion of the parts, but to hold the parts snugly to their places,so that there can be no play or rattling of the knob in an endwisedirection in relation tothe hub. l

I commonly construct the inner knob with an annular iiange c3, fittingover and around the end of the sleeve a?, and this in order to improvethe appearance of the latch and to prevent the fingers from being caughtbctween the knob and the sleeve.

IOO

llztvinglhns deserihed my invention, what-I l spindle having in angularportion sented ill olztin is I the huh :md a threadedend screwed intosind i5 knol), whereby the Said knol) may be locked and unlocked h vmoving` the spindle endwise froln'the opposite side of the ense.

In testimony whereof I hereunto sot my hund, this 18th day of December,1388, in the pres- 2o ence of two uttosting witnesses.

E[)\VARD S. HIINCIIESTER.

fitnessesz (I. 0. L. DILLAWAY, E. B. JAMES.

1. In combination with the latch-ense and the latch-operating huhtoothed at one side,

5 the axially-movable inner knob toothed to en I gage the huh, the outerknob nud its Spindle l having the angular and the threaded portions tseated in the hub and the inner knol), respect t ively, and the spring:toting to urge the Spins ro dle endwise in an outward direction. I

2. In combination with the lntelroperating hub toothed on one side, theknob toothed to interlock therewith, and nn axially-movable

